Super growth balls by Velda have been made especially for fertilization of water lilies and marsh plants. Nutrients, trace elements and minerals are delivered at once to plant roots, as a result of which luxurious growth and flowering is obtained of all kinds of water plants. Take care that growth balls will be put in the immediate environment of the roots of plants. Growth balls have been made from blue loam and they solely contain natural fertilizers.As the plant grows from March till August it should be fertilized every 6 to 8 weeks.Plant basket 30 cm 5 piecesPlant basket 40 cm 8 piecesPlant basket 50 cm 12 piecesMarsh plant soil per m2 25 pieces